Araiophyllum liasicum Beauvais, 1986
publication ID |
https://doi.org/ 10.5252/geodiversitas2021v43a22 |
publication LSID |
urn:lsid:zoobank.org:pub:6D1643AD-66A5-4678-9397-CE08E610D641 |
DOI |
https://doi.org/10.5281/zenodo.5764411 |
persistent identifier |
https://treatment.plazi.org/id/03A287A2-4851-3120-9AAD-630FFE70F83C |
treatment provided by |
Felipe |
scientific name |
Araiophyllum liasicum Beauvais, 1986 |
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Araiophyllum liasicum Beauvais, 1986
( Fig. 8 View FIG )
Araiophyllum liasicum Beauvais, 1986: 55 , pl. 12, fig. 3. — Vasseur 2018: 124-125, fig. 3.8.
TYPE MATERIAL. — Holotype MNHN.F. A32023 View Materials ( Beauvais 1986: 55, pl. 12, fig. 3). TYPE HORIZON. — Pliensbachian . TYPE LOCALITY. — Jebel Bou Dahar, High Atlas of Morocco. STUDIED SAMPLE. — Holotype: MNHN.F. A32023 View Materials . GEOGRAPHIC AND STRATIGRAPHIC RANGES. — Pliensbachian of Jebel Bou Dahar ( Morocco).
DESCRIPTION (modified after Beauvais 1986) Phaceloid colony with subcylindrical corallites multiplying by fissiparous intracalicular budding. The external part of the corallites is covered by an epitheca s.l. that reveals some regularly granulated costae. The calicular plateau has been observed on a very few corallites because of a very poor preservation but it shows the characteristic aspect described by Cuif (1975) for the genus: a hemispherical shape corresponding to a particular orientation of trabecular axes. Radial elements are totally porous, maybe a few less than in Upper Jurassic microsolenids. However, pores appear more abundant in the axial zone than in the periphery in transverse section because of the orientation of trabecular axes. Moniliform distal edge. Pennulae are numerous. Synapticulae abundant. Endotheca not observed. Weak, parietal papillose columella.
Calicular diameter: 4 to 12 mm – Number of septa: 92 to 120 – Septal density: 12 per 2 mm – Trabecular density: 4 to 5 per 1 mm.
SIMILARITIES AND DIFFERENCES
This species appears very close to the genus Dermoseris Koby, 1887 that shows as Araiophyllum subhemispheric calices. Araiophyllum liasicum differs from A. triasicum by the bigger size of the corallites, closer to the dimensions of the Upper Jurassic genus Dermoseris .
The more significant difference between the two genera would be the different microstructure of pennulae between Araiophyllum and Dermoseris : despite the low number of observations, it seems the latter shows regular granulations on the curved edges of pennulae and a more regular alternating disposition (see Cuif 1975).
MNHN |
France, Paris, Museum National d'Histoire Naturelle |
No known copyright restrictions apply. See Agosti, D., Egloff, W., 2009. Taxonomic information exchange and copyright: the Plazi approach. BMC Research Notes 2009, 2:53 for further explanation.
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Araiophyllum liasicum Beauvais, 1986
Vasseur, Raphaël & Lathuilière, Bernard 2021 |
Araiophyllum liasicum
VASSEUR R. 2018: 124 |
BEAUVAIS L. 1986: 55 |